JP6280704B2 - Control valve - Google Patents

Description

  The present invention relates to a control valve for controlling fluid flow.

  In a fuel filling system that extracts fuel gas from a high-pressure fuel gas supply source and fills the fuel tank, when fuel gas flows through the passage at high speed, noise is generated from a control valve such as a check valve installed in the passage There was something to do.

  As a coping method, Patent Document 1 discloses a check valve that includes an air damper inside a valve body and suppresses vibration of the valve body by a resistance provided by the air damper.

  Patent Document 2 discloses a check valve that includes a guide ring that is slidably contacted with a shaft portion of a valve body and suppresses vibration of the valve body by a sliding resistance provided by the guide ring.

JP 2001-99340 A JP 2011-80571 A

  However, such a conventional control valve has a problem that when a high-pressure, large-flow gas flows at a high speed, a vortex is generated on the downstream side of the valve body, and noise is generated from the gas flow itself. .

  The present invention has been made in view of the above problems, and an object thereof is to reduce the noise of a control valve.

The present invention is a control valve that controls the flow of fluid, and is defined between a seat portion through which fluid passes, a valve body portion of a poppet that moves relative to the seat portion, and a seat portion and a valve body portion. The poppet throttle channel is formed so that the flow channel area of the cross section perpendicular to the center line of the seat portion and the valve body portion of the poppet gradually increases from the upstream side to the downstream side. In the longitudinal section including the center line of the seat part and the valve body part, the valve seat angle between two imaginary lines along the inner peripheral surface of the seat part is between the two imaginary lines along the outer peripheral surface of the valve body part. A control valve characterized by being larger than the valve body angle and having an angle difference of 1.5 degrees or less between the valve seat angle and the valve body angle .

  In the present invention, in the poppet throttle passage where the flow passage area gradually increases from the upstream side to the downstream side, the fluid is rectified by flowing along the inner peripheral surface of the seat portion and the outer peripheral surface of the valve body portion of the poppet, It is possible to suppress the generation of eddy currents in the flow. Thereby, the noise of a control valve can be reduced.

It is sectional drawing of the control valve which concerns on 1st Embodiment of this invention. It is sectional drawing which shows a part of control valve which concerns on 1st Embodiment of this invention. The diagram which shows the relationship between the valve | bulb stroke which concerns on 1st Embodiment of this invention, and flow-path cross-sectional area. It is sectional drawing which shows a part of control valve concerning 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
A control valve 100 shown in FIG. 1 is used as a check valve interposed in a fuel gas passage in a fuel filling system that fills a fuel tank with high-pressure fuel gas (hereinafter referred to as gas) supplied from a supply source. .

  The control valve 100 includes a valve housing 10 having a seat portion 11 that allows gas to pass through, a poppet 50 having a valve body portion 51 that moves relative to the seat portion 11, and a valve closing that contacts the valve body portion 51 with the seat portion 11. And a spring 70 biasing in the direction.

  When the control valve 100 is opened, the poppet 50 moves downward on the paper surface of FIG. 1 against the spring 70 as the gas pressure introduced from the supply source increases, and the valve body 51 is seated. The gas from the supply source flows away as shown by the arrow in the figure.

  The control valve 100 includes a cylindrical valve housing 10 and a disc-shaped cover 20 that closes the opening end of the valve housing 10 as its casing. A poppet 50 and a spring 70 are accommodated between the valve housing 10 and the cover 20.

  Inside the valve housing 10, a cylindrical surface-shaped inlet port 13, a conical cylindrical surface-shaped seat portion 11, and a cylindrical surface-shaped inner wall portion 15 are formed concentrically with the center line O as the center. The inlet port 13 defines an inlet channel 29 through which gas is introduced from a supply source. The seat portion 11 defines a poppet throttle passage 30 that guides gas downstream from the valve body portion 51. The inner wall portion 15 defines a poppet lower flow path 31 that guides gas downstream of the poppet restriction flow path 30.

  The cover 20 is formed in a disk shape centered on the center line O, and the outer periphery thereof is fitted and fixed to the open end of the inner wall portion 15 of the valve housing 10. The cover 20 has a guide hole 25 that opens at the center thereof, and a plurality of outlet ports 23 that define an outlet channel 32. The guide hole 25 is formed in a cylindrical surface shape with the center line O as the center. The outlet ports 23 are provided at equal intervals on a circumference centered on the center line O.

  The poppet 50 is formed to be connected to the conical valve body 51, the disc-shaped spring receiving portion 55 formed to be connected to the downstream side of the valve body portion 51, and the downstream side of the spring receiving portion 55. A cylindrical rod portion 69. The valve body 51, the spring receiving portion 55, and the rod portion 69 are formed concentrically with the center line O as the center.

  In the poppet 50, the rod portion 69 is slidably inserted into the guide hole 25 of the cover 20. Accordingly, the poppet 50 is supported so as to move in the axial direction of the poppet 50 with the center line O extending with respect to the valve housing 10, and the concentricity of the valve body portion 51 with respect to the seat portion 11 is ensured.

  The coiled spring 70 is interposed between the spring receiving portion 55 and the cover 20 by being compressed, and presses the poppet 50 against the seat portion 11 of the valve housing 10.

  In the control valve 100, as the poppet 50 is displaced in the direction of the center line O, the cross-sectional area of the flow path defined between the seat portion 11 and the valve body portion 51 increases and decreases, and the gas passing therethrough The flow rate is controlled.

  The seat part 11 and the valve body part 51 are formed so that each longitudinal section is tapered with the center line O as the center, and the diameter is increased from the downstream side toward the upstream side.

  The seat portion 11 is formed so as to expand in diameter at a larger angle than the valve body portion 51 of the poppet 50. An annular seat portion upstream end 12 is formed at the upstream end of the seat portion 11 connected to the inlet port 13.

  When the control valve 100 is closed, the inlet passage 29 and the poppet throttle passage 30 are closed by the valve body 51 seated on the seat portion upstream end 12. When the control valve 100 is opened, the valve body portion 51 is separated from the seat portion 11, whereby the gas from the supply source flows into the poppet throttle passage 30.

  By the way, in the conventional control valve, when a high-pressure, large-flow gas is introduced, the flow of the gas passing through the valve body of the poppet is disturbed, and a jet including a vortex flow is generated on the downstream side of the valve body. High-frequency noise may be generated from the jet flow, or the valve body portion may repeatedly collide with the seat portion due to the vortex flow, resulting in noise.

  As a countermeasure, the poppet throttle passage 30 is formed such that the cross-sectional passage area perpendicular to the center line O of the valve body 51 of the seat portion 11 and the poppet 50 gradually increases from the upstream side to the downstream side. The Thus, the gas flowing through the poppet throttle passage 30 is rectified by flowing along the inner peripheral surface of the seat portion 11 and the outer peripheral surface of the valve body portion 51.

  In the longitudinal sectional view including the center line O shown in FIG. 2, the valve seat angle θ <b> 1 between the two virtual lines A <b> 11 along the inner peripheral surface of the seat portion 11 is two virtual lines along the outer peripheral surface of the valve body portion 51. It is formed larger than the valve element angle θ2 between A51. Thereby, the channel width and the channel cross-sectional area perpendicular to the center line O of the poppet throttle channel 30 are formed so as to gradually increase from the upstream side to the downstream side.

  In FIG. 3, a broken line indicates a flow path area B ′ at the downstream end (outlet) of the poppet throttle flow path in which the valve seat angle θ1 of the seat portion and the valve body angle θ2 of the valve body portion are formed to be equal as a comparative example. is there. In this comparative example, the ratio (A / B ′) of the flow path area A at the upstream end to the flow path area B ′ at the downstream end of the poppet throttle flow path is small in the opening range where the valve stroke X is small. In the case of this comparative example, in an opening range where the valve stroke X is small, a vortex is likely to occur from the poppet throttle channel to the poppet lower channel.

  FIG. 3 is a diagram showing the relationship between the flow path area of the cross section orthogonal to the center line O of the poppet throttle flow path 30 and the valve stroke X in which the poppet 50 moves in the axial direction (center line O direction). . As shown in this figure, the channel area A at the upstream end (inlet) of the poppet throttle channel 30 is smaller than the channel area B at the downstream end (outlet) of the poppet throttle channel 30 over the entire stroke region. The ratio (A / B) of the upstream end flow area A to the downstream end flow area B of the poppet throttle flow path 30 (A / B) is larger in the opening range where the valve stroke X is smaller than in the comparative example. .

  Since the gas flow passing through the control valve 100 is greatly throttled in the opening range where the valve stroke X is small compared to the opening range where the valve stroke X is large, the gas flowing from the poppet throttle channel 30 to the poppet lower channel 31 Tends to be a jet containing vortex. In the control valve 100, as described above, the ratio (A / B) of the upstream end flow area A to the downstream end flow area B of the poppet throttle flow path 30 is smaller than that of the comparative example. Increases in degrees. For this reason, in the opening range where the valve stroke X is small, the pressure of the gas flowing through the poppet throttle passage 30 is moderately reduced from the upstream side to the downstream side, and a vortex is generated from the poppet throttle passage 30 to the poppet lower passage 31. Is suppressed.

  The length L in the direction of the center line O of the sheet portion 11 in the poppet throttle channel 30 is formed to be larger than the minimum opening diameter D of the sheet portion 11. Thereby, the poppet restricting flow path 30 has a sufficient flow path length L, so that the flow path length through which the gas flows along the inner peripheral surface of the seat portion 11 and the outer peripheral surface of the valve body portion 51 is secured. A rectifying action that suppresses the generation of vortex in the gas is obtained.

  Hereinafter, the operation of the control valve 100 will be described.

  In a state where the pressure guided from the supply source to the inlet flow path 29 is lower than the set valve opening pressure, the valve body 51 abuts against the seat portion 11 by the biasing force of the spring 70, and the inlet flow path 29 and the poppet throttle flow path Block between 30.

  When the pressure guided from the supply source to the inlet channel 29 exceeds the valve opening pressure, the valve body 51 separates from the seat portion 11 against the urging force of the spring 70, and the inlet channel 29 and the poppet throttle channel 30 opens. As a result, the gas from the supply source flows through the inlet channel 29, the poppet throttle channel 30, the poppet lower channel 31, and the outlet channel 32, as indicated by arrows in FIG.

  In the poppet throttle channel 30, the channel width and the channel cross-sectional area between the seat portion 11 and the valve body 51 gradually increase from the upstream side to the downstream side, so the pressure of the gas flowing through the poppet throttle channel 30 is increased. The pressure gradually decreases from the upstream side to the downstream side, and the vortex flow from the poppet throttle channel 30 to the poppet lower channel 31 is suppressed.

  In the opening range where the valve stroke X of the poppet 50 is small, the flow velocity of the gas flowing through the poppet throttle passage 30 increases and eddy current tends to occur. Since the ratio of the road area A is ensured sufficiently large, it is possible to suppress the generation of vortex in the jet flowing out from the poppet throttle passage 30 to the poppet lower passage 31.

  Further, an experiment was conducted in which the noise level generated from the control valve 100 was measured while changing the angle difference (θ1−θ2). As a result of this experiment, it was found that the noise level can be kept small when the angle difference (θ1-θ2) is in the range of 1.5 degrees or less. On the other hand, it was found that when the angle difference (θ1−θ2) is greater than 1.5 degrees, the noise level is significantly increased. Based on the results of this experiment, the angle difference (θ1−θ2) is set in a range of 1.5 degrees or less.

  According to the above 1st Embodiment, there exists an effect shown below.

  [1] The control valve 100 includes a conical cylindrical surface portion 11 through which fluid (gas) passes, a valve body portion 51 of a poppet 50 that moves in the direction of the center line O of the seat portion 11, a seat portion 11 and a valve A poppet throttle channel 30 defined between the body parts 51, and the poppet throttle channel 30 has an upstream channel area in a cross section perpendicular to the center line of the seat part 11 and the valve body part 51. It is formed so as to gradually increase from the downstream side to the downstream side.

  Based on the above configuration, in the control valve 100, in the poppet throttle passage 30 where the flow passage area gradually increases from the upstream side to the downstream side, the fluid flows on the inner peripheral surface of the seat portion 11 and the outer peripheral surface of the valve body portion 51 of the poppet 50. It is possible to prevent the vortex from being generated in the jet flow that is rectified by flowing along the flow path and flows out from the poppet restricting flow path 30 to the downstream side.

  Thereby, it is possible to prevent high-frequency sound from being generated from the jet flowing out from the poppet throttle passage 30 to the downstream side. Further, it is possible to suppress the poppet 50 from vibrating due to the pressure fluctuation caused by the vortex, and it is possible to prevent the valve body portion 51 from repeatedly colliding with the seat portion 11 and generating noise.

  [2] The poppet throttle channel 30 is a valve seat angle between two virtual lines A11 along the inner peripheral surface of the seat portion 11 in a longitudinal section including the center line O of the valve portion 51 of the seat portion 11 and the poppet 50. θ1 is formed to be larger than the valve body angle θ2 between two virtual lines A51 along the outer peripheral surface of the valve body 51.

  Based on the above configuration, in the control valve 100, the pressure of the fluid flowing through the poppet throttle passage 30 gradually decreases, and the effect of rectifying the fluid flow is enhanced, and the resistance imparted to the gas flow can be suppressed.

  [3] The poppet throttle channel 30 is formed such that the angle difference (θ1−θ2) between the valve seat angle θ1 and the valve body angle θ2 is in a range of 1.5 degrees or less.

  Based on the above configuration, in the control valve 100, the flow path width and the cross-sectional area of the poppet throttle flow path 30 change moderately, so that the pressure of the fluid flowing through the poppet throttle flow path 30 gradually decreases and the flow of fluid , And the occurrence of vortex flow in the jet flowing out downstream from the poppet throttle channel 30 can be suppressed.

  [4] The length L in the direction of the center line O of the sheet portion 11 in the poppet throttle passage 30 is formed to be larger than the minimum opening diameter D of the sheet portion 11.

  Based on the above configuration, in the control valve 100, the flow path length necessary for the fluid flowing through the poppet throttle flow path 30 to be rectified in the process of flowing along the inner peripheral surface of the seat portion 11 and the outer peripheral surface of the valve body portion 51. Therefore, it is possible to suppress the generation of vortex in the jet flowing out from the poppet restricting flow path 30 to the downstream side.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code | symbol is attached | subjected to the structure same as the control valve of the said 1st Embodiment, and description is abbreviate | omitted.

  In the control valve 100 according to the first embodiment, the seat portion upstream end 12 on which the valve body portion 51 of the poppet 50 is seated is formed at the upstream end of the seat portion 11. On the other hand, in the control valve according to the second embodiment, a seal ring 76 is mounted on the outer periphery of the valve body 61, and the rectifying wall portion 71 has a seat portion 73 and a seal ring 76 on the upstream side of the seat portion 73. Has a valve seat portion 72 that abuts against the valve seat portion.

  The valve body 61 is formed with an annular housing groove 62 that opens to the outer periphery thereof. A seal ring 76 is accommodated in the accommodation groove 62.

  The rectifying wall portion 71 includes a seat portion 73 and a valve seat portion 72 that contacts the seal ring 76 on the upstream side of the seat portion 73. When the control valve is closed, the seal ring 76 comes into contact with the valve seat portion 72, thereby improving the sealing performance of the control valve.

  The valve seat angle θ3 of the two imaginary lines A73 along the inner peripheral surface of the seat portion 73 is formed larger than the valve body angle θ4 of the two imaginary lines A61 along the outer peripheral surface of the valve body portion 61. A poppet throttle passage 35 is defined between the seat portion 73 and the valve body portion 61 of the rectifying wall portion 71.

  The poppet throttle channel 35 is formed such that the channel width and the channel area orthogonal to the center line O gradually increase from the upstream side to the downstream side. Thereby, the gas flowing through the poppet restricting flow path 35 is rectified by flowing along the inner peripheral surface of the seat portion 73 and the outer peripheral surface of the valve body portion 61, and the generation of vortex flow is suppressed.

  According to the above 2nd Embodiment, while exhibiting the effect of said [1]-[4] similarly to 1st Embodiment, there exists an effect shown below.

  [5] The control valve has a valve seat portion 72 on the upstream side of the seat portion 73, and a seal ring 76 is attached to the outer periphery of the valve body portion 61, and the seal ring 76 contacts the valve seat portion 72.

  Based on the above-described configuration, the control valve ensures sealing performance when the valve is closed via the seal ring 76 and suppresses the generation of vortex in the jet flowing out from the poppet throttle passage 35 to the downstream side when the valve is opened. The occurrence of noise due to eddy currents can be suppressed.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, in the above embodiment, the poppet throttle channels 30 and 35 are provided over the entire circumference of the poppets 50 and 60, but a plurality of slit-like poppet throttle channels may be provided in the poppet.

  Furthermore, the control valve 100 of the above embodiment is used as a check valve interposed in the fuel gas passage in the fuel filling system, but is not limited to this, and in other machines and facilities, the control valve 100 has a high pressure and a large flow rate. You may use as a non-return valve or a relief valve interposed in the circuit through which gas flows. Moreover, although the fluid which flows through the control valve 100 was fuel gas, it is not limited to this and may be other gas.

DESCRIPTION OF SYMBOLS 11, 73 Seat part 30, 35 Poppet throttle flow path 50, 60 Poppet 51 Valve body part 71 Rectification wall part 72 Valve seat part 76 Seal ring 100 Control valve

Claims (3)

A control valve for controlling the flow of fluid,
A sheet portion through which the fluid passes;
A valve body portion of a poppet that moves relative to the seat portion;
A poppet throttle channel defined between the seat part and the valve body part,
The poppet throttle channel is formed such that the channel area of the cross section perpendicular to the center line of the seat part and the valve body part gradually increases from the upstream side to the downstream side ,
In a longitudinal section including the center line of the seat portion and the valve body portion, the valve seat angle between two imaginary lines along the inner peripheral surface of the seat portion is two imaginary lines along the outer peripheral surface of the valve body portion. Larger than the valve element angle between,
An angle difference between the valve seat angle and the valve body angle is in a range of 1.5 degrees or less . 2. The control valve according to claim 1, wherein a length of the seat portion in a center line direction in the poppet throttle passage is larger than a minimum opening diameter of the seat portion . A valve seat on the upstream side of the seat,
A seal ring is attached to the outer periphery of the valve body,
The control valve according to claim 1, wherein the seal ring is in contact with a valve seat portion .

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